Combine Ingredients: In a medium saucepan, whisk together the cacao powder and coconut sugar. Gradually add the milk, stirring until smooth.
Heat and Stir: Place the saucepan over medium heat, stirring constantly to avoid lumps. Allow the mixture to come to a gentle simmer.
Simmer and Thicken: Reduce heat to low and let the syrup simmer for 3–5 minutes, stirring frequently, until it thickens slightly.
Add Vanilla and Salt: Remove from heat and stir in the vanilla extract and a pinch of salt.
Cool and Store: Let the syrup cool before transferring it to a jar or airtight container. Store it in the refrigerator for up to 2 weeks.